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authorLinus Walleij <linus.walleij@linaro.org>2013-06-13 21:21:31 +0200
committerLinus Walleij <linus.walleij@linaro.org>2013-06-17 13:54:39 +0200
commit7fca1f20c0f3e9d7a3b23ee1fc9e832f520f3f1a (patch)
treef09643fa89e79047787665d117cd56f0068094d2
parent985062588d55deebc62bee80e979ea03d4a917ea (diff)
downloadop-kernel-dev-7fca1f20c0f3e9d7a3b23ee1fc9e832f520f3f1a.zip
op-kernel-dev-7fca1f20c0f3e9d7a3b23ee1fc9e832f520f3f1a.tar.gz
ARM: u300: switch to using syscon regmap for board
This switches the code using a local remapping of the system controller to enable the U300 board to be self-powered over to making the U300-specific syscon compatible with the MFD generic syscon driver, selecting the generic syscon driver, and augmenting the board power code to pick the regmap and manipulate the syscon from the regmap side of things. Cc: Dong Aisheng <dong.aisheng@linaro.org> Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--arch/arm/boot/dts/ste-u300.dts2
-rw-r--r--arch/arm/mach-u300/Kconfig1
-rw-r--r--arch/arm/mach-u300/regulator.c19
3 files changed, 10 insertions, 12 deletions
diff --git a/arch/arm/boot/dts/ste-u300.dts b/arch/arm/boot/dts/ste-u300.dts
index 05a0821..8a1032c 100644
--- a/arch/arm/boot/dts/ste-u300.dts
+++ b/arch/arm/boot/dts/ste-u300.dts
@@ -31,7 +31,7 @@
};
syscon: syscon@c0011000 {
- compatible = "stericsson,u300-syscon";
+ compatible = "stericsson,u300-syscon", "syscon";
reg = <0xc0011000 0x1000>;
clk32: app_32_clk@32k {
#clock-cells = <0>;
diff --git a/arch/arm/mach-u300/Kconfig b/arch/arm/mach-u300/Kconfig
index e2f350f..09f4dda 100644
--- a/arch/arm/mach-u300/Kconfig
+++ b/arch/arm/mach-u300/Kconfig
@@ -20,6 +20,7 @@ config ARCH_U300
select PINCTRL_COH901
select PINCTRL_U300
select SPARSE_IRQ
+ select MFD_SYSCON
select USE_OF
help
Support for ST-Ericsson U300 series mobile platforms.
diff --git a/arch/arm/mach-u300/regulator.c b/arch/arm/mach-u300/regulator.c
index 273fceb..bf40cd4 100644
--- a/arch/arm/mach-u300/regulator.c
+++ b/arch/arm/mach-u300/regulator.c
@@ -15,9 +15,8 @@
#include <linux/platform_device.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/consumer.h>
-/* Those are just for writing in syscon */
-#include <linux/of_address.h>
-#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
/* Power Management Control 16bit (R/W) */
#define U300_SYSCON_PMCR (0x50)
@@ -59,9 +58,8 @@ static int __init __u300_init_boardpower(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device_node *syscon_np;
- static void __iomem *syscon_base;
+ struct regmap *regmap;
int err;
- u32 val;
pr_info("U300: setting up board power\n");
@@ -70,9 +68,9 @@ static int __init __u300_init_boardpower(struct platform_device *pdev)
pr_crit("U300: no syscon node\n");
return -ENODEV;
}
- syscon_base = of_iomap(syscon_np, 0);
- if (!syscon_base) {
- pr_crit("U300: could not remap syscon\n");
+ regmap = syscon_node_to_regmap(syscon_np);
+ if (!regmap) {
+ pr_crit("U300: could not locate syscon regmap\n");
return -ENODEV;
}
@@ -96,9 +94,8 @@ static int __init __u300_init_boardpower(struct platform_device *pdev)
* the rest of the U300 power management is implemented.
*/
pr_info("U300: disable system controller pull-up\n");
- val = readw(syscon_base + U300_SYSCON_PMCR);
- val &= ~U300_SYSCON_PMCR_DCON_ENABLE;
- writew(val, syscon_base + U300_SYSCON_PMCR);
+ regmap_update_bits(regmap, U300_SYSCON_PMCR,
+ U300_SYSCON_PMCR_DCON_ENABLE, 0);
/* Register globally exported PM poweroff hook */
pm_power_off = u300_pm_poweroff;
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